html,
body {
  scroll-behavior: smooth;
}
.banner{
    width: 1200px;
    margin: 0 auto;
}
.mr1{
    margin-right: -40px;
}
.mr2{
    margin-bottom: 180px;
}
.banner .img{
    overflow: hidden;
    width: 1200px;
    height: 300px;
}
.product{
    width: 1200px;
    margin: 0 auto;
}
.product .box-hd {
    overflow: hidden;
    padding: 49px 0 65px;
}
.product .box-hd .title {
    float: left;
    font-size: 14px;
    line-height: 14px;
}
.product .box-hd{
    width: 1200px;
    height: 20px;
}
.product .pro-nav{
    float: right;
    width: fit-content;
    overflow: hidden;
}
.product .pro-nav .pro-nav-item{
    float: left;
    width: 98px;
    line-height: 14px;
    font-size: 14px;
    text-align: center;
}
.product .pro-nav .nav-line{
    width: 1px;
    height: 8px;
    float: left;
    background-color: #b5b5b5;
    margin-top: 3px;
}
.product .pro-nav-item .line{
    display: block;
    width: 12px;
    height: 1px;
    background-color: #688cac;
    margin: 3px auto 0;
    opacity: 0;
}
.product .pro-nav-item:hover a{
    font-size: 16px;
    color: #688cac;
}
.product .pro-nav-item:hover .line{
    opacity: 1;
}
.product .pro-nav-item.actyve a{
    font-size: 16px;
    color: #688cac;
}
.product .pro-nav-item.actyve .line{
    opacity: 1;
}



.product .pro-list{
    overflow: hidden;
}
.product .pro-list .pro-item{
    float: left;
    width: 360px;
    height: 360px;
    margin-right: 60px;
    cursor: pointer;
    position: relative;
}
.product .pro-list .pro-item .img{
    width: 360px;
    height: 320px;
}
.pro-list .pro-item .info{
    width: 154px;
    height: 40px;
    margin: 0 auto;
}
.pro-list .pro-item .info .en{
    line-height: 16px;
    font-size: 16px;
}
.pro-list .pro-item .info .cn{
    line-height: 14px;
    font-size: 14px;
}


.pro-list .pro-item .mask{
    position: absolute;
    top: 0;
    left: 0;
    width: 360px;
    height: 320px;
    background: rgba(0,0, 0, 0.5);
    border-radius: 8px;
    opacity: 0;
}
.pro-item .mask .line{
    position: absolute;
    width: 80px;
    height: 1px;
    background-color: #f8f8f8;
    top: 154px;
    left: 0;
}
.pro-item .mask .num{
    position: absolute;
    font-size: 30px;
    line-height: 25px;
    color: #f8f8f8;
    top: 131px;
    left: 84px;
}
.pro-item .mask .en{
    position: absolute;
    top: 171px;
    left: 69px;
    font-size: 16px;
    color: #f8f8f8;
}
.pro-item .mask .cn{
    position: absolute;
    top: 197px;
    left: 69px;
    font-size: 14px;
    color: #f8f8f8;
}
.product .pro-list .pro-item:hover .mask{
    opacity: 1;
}
.product .pro-list .pro-item:hover .info{
    visibility: hidden;
}